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   <title>Relation classes</title>
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     <h1>Relation class addressing</h1>

     <p> References of the form <code>http://host/u/...</code> for any
       'u' in the range '0' - '9', 'a' - 'z' are reserved "Path U"
       references.
     </p>

     <p> This package exists as a placeholder for the abstract purpose
       of delegating the protected address relation classes '0' - '9',
       'a' - 'f' into a reserved package.
     </p>

     <p> Other reserved "Path U" user space, 'g' - 't', 'v' - 'z' ('g'
       - 'z' excluding 'u'), may be delegated to arbitrary SX
       packages.
     </p>

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     <h2>Relation class description</h2>

     <p> Address relation class 'a' is the normal content store, a
       request of the form <code>http://host/u/meta</code> for any 'u'
       in the range '0' - '9', 'a' - 'z' should return a Description
       set when the relation class is in use.
     </p>

     <p> For example, a request to the
       reference <code>http://www.syntelos.com/a/meta</code> returns
       <pre>
Description: User space content store
Description: Host local configuration store
       </pre>
       which declares the main content store for these purposes.
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